Temperature thermostatic valve

Abstract

Provided is a thermostatic valve including a first valve body, a second valve body, a third valve body, a first thermal actuator, a second thermal actuator, a valve core, a first valve port, a second valve port and a third valve port. The first valve body includes a second cavity and a third cavity. The second thermal actuator is sealedly fixed in the first valve body to isolate the second cavity from the third cavity. At least a part of the valve core is located in the second cavity. The valve core is connected to, or is integrated with, or abuts against a second valve stem of the second thermal actuator. The second thermal actuator is configured to act in response to a change in temperature of a fluid in the third cavity. The valve core is configured to open the second valve port or the third valve port in response to an action of the second valve stem.

What is claimed is: 
     
       1. A thermostatic valve, comprising:
 a first valve body, a second valve body, a third valve body, a first thermal actuator, a second thermal actuator, a valve core, a first valve port, a second valve port and a third valve port; wherein 
 the first valve body comprises a second cavity and a third cavity, the second thermal actuator is sealedly fixed in the first valve body to isolate the second cavity from the third cavity; 
 at least a part of the valve core is located in the second cavity, and the valve core is connected to, or is integrated with, or abuts against a second valve stem of the second thermal actuator; 
 the second thermal actuator is configured to act in response to a change in temperature of a fluid in the third cavity, and the valve core is configured to open the second valve port or the third valve port in response to an action of the second valve stem; 
 one end of the second valve body is fixed to the first valve body, and another end of the second valve body is fixed to the third valve body; the third valve body comprises a first cavity, the second valve body comprises a flow passage, and the flow passage is capable of communicating with the first cavity through the first valve port and capable of communicating with the second cavity through the second valve port; and 
 the first thermal actuator is configured to act in response to a change in temperature of a fluid in the first cavity to open or close the first valve port or to adjust an opening degree of the first valve port. 
 
     
     
       2. The thermostatic valve according to  claim 1 , wherein the third valve body comprises a first inlet passage, the first valve body comprises a second inlet passage and a first outlet passage, the second inlet passage is in communication with the second cavity, the first outlet passage is in communication with the second cavity, and the first valve port is located at an end of the flow passage closer to the third valve body; and
 wherein the thermostatic valve comprises at least two working states: a first working state and a second working state; wherein 
 in the first working state, the first valve port and the third valve port are closed, the second valve port is opened, the first inlet passage is not in communication with the first outlet passage, and the second inlet passage is not in communication with the first outlet passage; and 
 in the second working state, the third valve port is closed, the first valve port and the second valve port are opened, the first inlet passage is in communication with the first outlet passage through the first valve port and the second valve port, and the second inlet passage is not in communication with the first outlet passage. 
 
     
     
       3. The thermostatic valve according to  claim 2 , further comprising a first spring wherein
 an inner wall of the third valve body is formed with a first shoulder on a side of the first cavity facing towards the first inlet passage; and 
 the first thermal actuator comprises a first body and a first valve stem, one end of the first valve stem is inserted into the first body, the first body comprises a large diameter portion and a small diameter portion; wherein the large diameter portion of the first body is provided with a first end wall portion on a side of the first body facing away from the small diameter portion, and the first end wall portion is configured to mate with one end of the second valve body to close the flow passage. 
 
     
     
       4. The thermostatic valve according to  claim 3 , wherein the large diameter portion of the first body is provided with a second end wall portion on a side facing towards the small diameter portion of the first body, the first spring comprises a small end portion and a large end portion, the first spring is sleeved on the first body, the small end portion abuts against the second end wall, and the large end portion abuts against the first shoulder. 
     
     
       5. The thermostatic valve according to  claim 4 , wherein the second valve body further comprises a valve stem seat, the valve stem seat is disposed in the flow passage, and the valve stem seat comprises a blind hole portion and a communicating hole, wherein the communicating hole is in communication with flow passages on both sides of the valve stem seat, the blind hole portion comprises a blind hole, one end of the first valve stem is inserted into the blind hole, the first valve stem is clearance-fitted with the blind hole, and the first valve stem abuts against a bottom of the blind hole. 
     
     
       6. The thermostatic valve according to  claim 5 , wherein the second valve body comprises a tubular body, wherein the tubular body comprises a first port portion and a second port portion, the tubular body is provided with a first annular protrusion adjacent to the first port portion, a first annular groove is provided between the first port portion and the first annular protrusion, the tubular body is provided with a second annular protrusion adjacent to the second port portion, and a second annular groove is provided between the second port portion and the second annular protrusion;
 the thermostatic valve is provided with a first sealing ring at the first annular groove, wherein a part of the first sealing ring is accommodated in the first annular groove, and the first sealing ring is configured to seal a connection between the second valve body and the third valve body; 
 the thermostatic valve is provided with a second sealing ring at the second annular groove, wherein a part of the second sealing ring is accommodated in the second annular groove, and the second sealing ring is configured to seal a connection between the second valve body and the first valve body. 
 
     
     
       7. The thermostatic valve according to  claim 6 , further comprising a circlip; wherein the third valve body further comprises a first connecting portion, and the first connecting portion comprises a small diameter portion and a large diameter portion; and the first valve body comprises a second connecting portion, and the second connecting portion comprises a large diameter portion and a small diameter portion; wherein the first port portion extends into the first connecting portion and is fixedly connected to the first connecting portion by the circlip, the first port portion is clearance-fitted with the small diameter portion of the first connecting portion, and the first annular protrusion is clearance-fitted with the large diameter portion of the first connecting portion; and the second port portion extends into the second connecting portion and is fixedly connected to the second connecting portion by the circlip, the second port portion is clearance-fitted with the small diameter portion of the second connecting portion, and the second annular protrusion is clearance-fitted with the large diameter portion of the second connecting portion. 
     
     
       8. The thermostatic valve according to  claim 7 , wherein an inner circumferential surface of the large diameter portion of the first connecting portion is provided with a first planar portion, the second valve body is provided with a second planar portion, and an inner circumferential surface of the large diameter portion of the second connecting portion is provided with a third planar portion, wherein one end of the second planar portion mates with the first planar portion, and another end of the second planar portion mates with the third planar portion. 
     
     
       9. The thermostatic valve according to  claim 8 , wherein the first valve body further comprises a third inlet passage and a second outlet passage, wherein the second outlet passage is in communication with the third cavity, and the third inlet passage is in communication with the third cavity. 
     
     
       10. The thermostatic valve according to  claim 9 , wherein the first outlet passage is communication with the second cavity at the small diameter portion of the second connecting portion, and the second cavity is partially formed in the small diameter portion of the second connecting portion. 
     
     
       11. The thermostatic valve according to  claim 10 , wherein the first valve body further comprises a seat hole portion, the seat hole portion is disposed between an inner wall of the first valve body corresponding to the second cavity and an inner wall of the first valve body corresponding to the third cavity, and the seat hole portion comprises a seat hole; and the second thermal actuator comprises a second body, the second body comprises a large diameter portion and a small diameter portion; wherein a diameter of the small diameter portion of the second body is less than an inner diameter of the seat hole, a space between the small diameter portion of the second body and an inner wall of the seat hole portion is in communication with the third cavity, the large diameter portion of the second body is clearance-fitted or interference fitted with the inner wall of the seat hole portion, and the small diameter portion of the second body penetrates through the seat hole into the third cavity. 
     
     
       12. The thermostatic valve according to  claim 11 , wherein the valve core comprises a cylindrical main body portion, wherein the cylindrical main body portion comprises a large diameter portion and a small diameter portion; and the valve core is provided with at least one column-shaped portion at an end of the small diameter portion, acing away from the large diameter portion, wherein the at least one column-shaped portion, at least partially extends into the flow passage and is slidably fitted with an inner wall of the second valve body corresponding to the flow passage. 
     
     
       13. The thermostatic valve according to  claim 12 , wherein at least a part of a peripheral wall of the main body portion is configured to be slidably fitted with the inner wall of the second valve body corresponding to the flow passage, and the large diameter portion of the main body portion is provided with an annular protrusion at a center or around the center of a side of the large diameter portion facing away from the small diameter portion; one end of the second valve stem of the second thermal actuator extends into the annular protrusion and abuts against the large diameter portion of the main body portion, and the second valve stem of the second thermal actuator is clearance-fitted with the annular protrusion;
 the second port portion is further provided with a first end annular groove at an end of the second port portion; and 
 a second spring is sleeved on the small diameter portion of the main body portion, one end of the second spring abuts against the large diameter portion of the main body portion, and another end of the second spring abuts against the first end annular groove. 
 
     
     
       14. The thermostatic valve according to  claim 1 , wherein a circumferential surface of the large diameter portion of the second body is further with a third annular groove, a fourth annular groove, and a fifth annular groove, the fourth annular groove is disposed between the third annular groove and the fifth annular groove, and the first valve body is provided with a ninth through hole at a position of the first valve body corresponding to the fourth annular groove;
 the thermostatic valve further comprises a clip which penetrate through the ninth through hole and mates with the fourth annular groove; the thermostatic valve is provided with a third sealing ring at the third annular groove and at the fifth annular groove separately, wherein the third sealing ring is configured to isolate a fluid in the second cavity from the fluid in the third cavity; and an inner circumferential surface of the small diameter portion of the second connecting portion is provided with a guiding rib which mates with a circumferential surface of the large diameter portion of the main body portion. 
 
     
     
       15. The thermostatic valve according to  claim 7 , wherein the valve core comprises a cylindrical main body portion, wherein the cylindrical main body portion comprises a large diameter portion and a small diameter portion; and the valve core is provided with at least one column-shaped portion at an end of the small diameter portion, facing away from the large diameter portion, wherein the at least one column-shaped portion, at least partially extends into the flow passage and is slidably fitted with an inner wall of the second valve body corresponding to the flow passage. 
     
     
       16. The thermostatic valve according to  claim 1 , wherein the valve core comprises a cylindrical main body portion, wherein the cylindrical main body portion comprises a large diameter portion and a small diameter portion; and the valve core is provided with at least one column-shaped portion at an end the small diameter portion, facing away from the large diameter portion, wherein the at least one column-shaped portion, at least partially extends into the flow passage and is slidably fitted with an inner wall of the second valve body corresponding to the flow passage. 
     
     
       17. The thermostatic valve according to  claim 16 , wherein a circumferential surface of the large diameter portion of the second body is further with a third annular groove, a fourth annular groove, and a fifth annular groove, the fourth annular groove is disposed between the third annular groove and the fifth annular groove, and the first valve body is provided with a ninth through hole at a position of the first valve body corresponding to the fourth annular groove;
 the thermostatic valve further comprises a clip which penetrate through the ninth through hole and mates with the fourth annular groove: the thermostatic valve is provided with a third sealing ring at the third annular groove and at the fifth annular groove separately, wherein the third sealing ring is configured to isolate a fluid in the second cavity from the fluid in the third cavity and an inner circumferential surface of the small diameter portion of the second connecting portion is provided with a guiding rib which mates with a circumferential surface of the large diameter portion of the main body portion. 
 
     
     
       18. The thermostatic valve according to  claim 17 , wherein the first valve, the second valve body, the third valve body and the valve core are made of plastic materials and integrally formed through an injection molding process;
 the thermostatic valve is further provided with a passage parallel to the first valve port, wherein one end of the passage is in communication with the first cavity, another end of the passage is in communication with the flow passage, and a flow rate of the passage is much less than a flow rate of the first valve port; and 
 
       when the first body abuts against the first port portion, the first valve port is closed, and the flow passage is in communication with the first inlet passage through the passage and the first cavity.